Power bank



1. Power bank

1.1 is a front view of a power bank showing our new design;

1.2 is a back view thereof;

1.3 is a left view thereof;

1.4 is right view thereof;

1.5 is a top view thereof;

1.6 is a bottom view thereof; and

1.7 is a front and top side perspective view thereof.

The broken lines in the drawings are for the purpose of illustrating portions of the power bank that form no part of the claimed design. 

CLAIM The ornamental design for a power bank, as shown and described. 